Adjustable hydro-static radial piston machine

Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Radially disposed cylinders

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Details

417 63, 417217, 417273, F04B 106

Patent

active

057524270

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a hydro-static radial piston machine with an adjustable reciprocating ring.
Such a machine is generally known. It is used in many applications in hydraulics, since by its use it is possible to reduce the expense for open and/or closed-loop control valves. The major advantages in drives for such radial piston machines, besides the simplicity of the design, is that they have little loss and the machine can be electrically triggered quickly and precisely. For triggering, adjusting pistons acted upon by pressure and integrated into the machine housing are used; they act on the outer circumference of the reciprocating ring along its adjusting direction. The eccentricity of the reciprocating ring, which is proportional to the supply quantity of the machine, can be used as a controlled variable and detected by an inductive travel pickup. This actual value is compared with a guide value by an electronic closed-loop control amplifier and serves to regulate the position of the reciprocating ring. In some applications it is unfavorable that this inductive travel pickup cannot be disposed anywhere else than in an extension of the adjusting piston, thus making the machine even larger, in what is already its largest dimension. Since the travel pickup is an additional part to be mounted, the structural expense of the machine is also increased.
German Patent Disclosure DE 35 13 736 A1 has also disclose a hydro-static radial piston machine with a measuring instrument for detecting the eccentricity of a rotatably supported eccentric ring. A hydraulic rod linkage transmits the deflection of a transducer tappet, which is supported on the inside of the eccentric ring, and whose deflection is dependent on the eccentricity of the eccentric ring, to a receiver tappet. The latter is provided with a coil core, which in accordance with the existing eccentricity of the eccentric ring plunges to a variable depth in a measuring coil and trips a measurement signal there. This measuring instrument has many mechanical components and entails major expense for the hydraulic coupling; signal pickup must take place in a rotating machine shaft.


ADVANTAGES OF THE INVENTION

The electrohydraulically adjustable machine of the invention has the advantage over the prior art that the means used comprise inexpensive measuring instruments that are integrated in already existing components of the machine, or that existing machine components can be used as measured value transducers. As a result, neither the structural volume nor the expense for construction of the machine is increased.
Another advantage is that a digital measurement signal is present that can be used by an electronic circuit both to determine the eccentricity of the reciprocating ring and to determine the rpm of the rotor, and for further functions optionally as well, such as for damping noise in the machine.
It is also worth noting that the scanning time is flexible within certain limits, depending on the demands of a given application, because the number of slide blocks used as measured value transducers can be varied. The shortest scanning times can accordingly be attained if all the slide blocks are used as measured value transducers. Another favorable aspect is that the measuring instrument operates in contactless fashion and is therefore subject to neither friction nor wear, which is expressed in a long service life and low maintenance.
Other advantageous features will become apparent from the specification.


DRAWING

One exemplary embodiment of the invention is shown in the drawing and described in further detail in the ensuing description.
FIG. 1 shows a cross section of a radial piston machine in a simplified illustration; and FIG. 2 is a graph showing the course of the signal generated in the measured value receiver as a function of time and of the rotational angle of the rotor.


DESCRIPTION OF THE EXEMPLARY EMBODIMENT

FIG. 1 shows a radial piston machine 10, whose housing is closed off by a cap, not shown. A substantially cylindrical

REFERENCES:
patent: 4601641 (1986-07-01), Kuroyangi et al.
patent: 4711616 (1987-12-01), Tsukahara et al.

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